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Efficient and stable organic light-emitting devices (OLEDs) can be fabricated using hole transporting materials with a high glass transition temperature (Tg), as reported here. A series of devices utilizing high Tg hole transporting layers, consisting of compounds with a biphenyl backbone such as the one shown in the Figure, are investigated with respect to their I–V characteristics, external quantum efficiencies, ionization potentials, and electron affinities.
O’Brien et al. (1998) studied this question.